Agent X402 Paywall MCP vs Kx402

In-depth architectural comparison of the Agent X402 Paywall MCP and Kx402 MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

Which MCP Server Should You Choose?

Choose Agent X402 Paywall MCP when:

• You need dedicated capabilities in the Finance & Fintech domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore Agent X402 Paywall MCP Details

Choose Kx402 when:

• You need dedicated capabilities in the Finance & Fintech domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore Kx402 Details

Feature & Specification Comparison

Specification	Agent X402 Paywall MCP Finance & Fintech	Kx402 Finance & Fintech
Summary	Agent x402 Paywall MCP — Coinbase HTTP 402 protocol + on-chain settlement. Agents pay per-call	Kaspa x402 agent payer — pay x402 v2 services on Kaspa (KAS) per call, no account or API key
Category & Scope	Finance & Fintech	Finance & Fintech

Tools & Capabilities Breakdown

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

{
  "mcpServers": {
    "agent-x402-paywall-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@smithery/cli@latest"
      ]
    }
  }
}

{
  "mcpServers": {
    "kx402": {
      "command": "npx",
      "args": [
        "-y",
        "kx402",
        "mcp"
      ]
    }
  }
}

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